Halo3 Xbox tip details

When fighting Brute Chieftains I find the best way to kill them is to melee-walk up close to one(about a sword lunge away) and most of the time they will do the slow lunging attack with their hammer.

When they do this sidestep them and run behind and assassinate them. If you haven't shot them then you will get their invincibility as well. If they jump through the air and raise the hammer above their head quickly run back from them, as they turn towards you rather than looking at where you -were.-